/*
 * contrib/btree_gist/btree_utils_var.h
 */
#ifndef __BTREE_UTILS_VAR_H__
#define __BTREE_UTILS_VAR_H__

#include "btree_gist.h"

#include "access/gist.h"
#include "mb/pg_wchar.h"

/* Variable length key */
typedef bytea GBT_VARKEY;

/* Better readable key */
typedef struct
{
    bytea       *lower,
               *upper;
} GBT_VARKEY_R;

/*
 * type description
 */
typedef struct
{

    /* Attribs */

    enum gbtree_type t;            /* data type */
    int32        eml;            /* cached pg_database_encoding_max_length (0:
                                 * undefined) */
    bool        trnc;            /* truncate (=compress) key */

    /* Methods */

    bool        (*f_gt) (const void *, const void *, Oid, FmgrInfo *);    /* greater than */
    bool        (*f_ge) (const void *, const void *, Oid, FmgrInfo *);    /* greater equal */
    bool        (*f_eq) (const void *, const void *, Oid, FmgrInfo *);    /* equal */
    bool        (*f_le) (const void *, const void *, Oid, FmgrInfo *);    /* less equal */
    bool        (*f_lt) (const void *, const void *, Oid, FmgrInfo *);    /* less than */
    int32        (*f_cmp) (const void *, const void *, Oid, FmgrInfo *); /* compare */
    GBT_VARKEY *(*f_l2n) (GBT_VARKEY *, FmgrInfo *flinfo);    /* convert leaf to node */
} gbtree_vinfo;



extern GBT_VARKEY_R gbt_var_key_readable(const GBT_VARKEY *k);

extern GBT_VARKEY *gbt_var_key_copy(const GBT_VARKEY_R *u);

extern GISTENTRY *gbt_var_compress(GISTENTRY *entry, const gbtree_vinfo *tinfo);

extern GBT_VARKEY *gbt_var_union(const GistEntryVector *entryvec, int32 *size,
              Oid collation, const gbtree_vinfo *tinfo, FmgrInfo *flinfo);

extern bool gbt_var_same(Datum d1, Datum d2, Oid collation,
             const gbtree_vinfo *tinfo, FmgrInfo *flinfo);

extern float *gbt_var_penalty(float *res, const GISTENTRY *o, const GISTENTRY *n,
                Oid collation, const gbtree_vinfo *tinfo, FmgrInfo *flinfo);

extern bool gbt_var_consistent(GBT_VARKEY_R *key, const void *query,
                   StrategyNumber strategy, Oid collation, bool is_leaf,
                   const gbtree_vinfo *tinfo, FmgrInfo *flinfo);

extern GIST_SPLITVEC *gbt_var_picksplit(const GistEntryVector *entryvec, GIST_SPLITVEC *v,
                  Oid collation, const gbtree_vinfo *tinfo, FmgrInfo *flinfo);

extern void gbt_var_bin_union(Datum *u, GBT_VARKEY *e, Oid collation,
                  const gbtree_vinfo *tinfo, FmgrInfo *flinfo);

#endif
